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Petroleum Geology Acronyms

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Acoustic porosity (PORA)

This is a log of measurements along a well bore (a well-log). You might have encountered this acronym PORA in your log evaluation software or any (ASCII) log files provided by the logging company. The code stands for 'Acoustic porosity'. This log is not often acquired after (or during) drilling a well.

This log displays readings of the porosity calculated using the acoustic slowness measurement from a sonic log.

In general this log thus reflects units of the apparent porosity. Better said, the initial estimate of porosity, normally from logs, not corrected for the (often large) effects of clays, gas, etc. Such estimates should only be used for qualitative interpretation of clean, gas-free intervals.

Simply said, this is a log that describes the pore volume per unit gross volume. Porosity is determined from measurements on cores or interpreted from logs.

Furthermore, this can be explained by looking at the volume fraction. In other words, the ratio of the volumes occupied by two components, or by one component to the total volume of the system.

Data for this log is produced by a tool that uses a acoustic logging technique and can be used to investigate the porosity of the formation. A similar log might be: Sonic Porosity (SPHI).

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